/Engine/Source/Runtime/AnimGraphRuntime/Public/BoneControllers/AnimNode_SkeletalControlBase.h
Visual warnings are shown on the node but not logged as an error for build system, use with care The warnigns are cleared at CacheBones_AnyThread and should be added during InitializeBoneReferences
void AddBoneRefMissingVisualWarning ( const [FString](API\Runtime\Core\Containers\FString) & BoneName, const [FString](API\Runtime\Core\Containers\FString) & SkeletalMeshName )